A case-control (or retrospective) study was conducted to investigate a relationship between the colors of helmets worn by motorcycle drivers and whether they are injured or killed in a crash. Results are given in the accompanying table. Using a0.01significance level, test the claim that injuries are independent of helmet color. Color of Helmet BlackWhiteYellowRedBlue Controls (not injured) 4863763115883 Cases (injured or killed) 21612596639 Identify the null and alternative hypotheses. Choose the correct answer below. Compute the test statistic.( round 3 decimal places)Find the critical value(s). (3 decimal places)What is the conclusion based on the hypothesis test?

Formulation of hypothesis Null Hypothesis: - Injuries are independent of helmet colourAlternative…

Answered: A case-control (or retrospective)…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

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A case-control (or retrospective) study was conducted to investigate a relationship between the colors of helmets worn by motorcycle drivers and whether they are injured or killed in a crash. Results are given in the accompanying table. Using a

0.01

significance level, test the claim that injuries are independent of helmet color.

	Color of Helmet
	Black	White	Yellow	Red	Blue
Controls (not injured)	486	376	31	158	83
Cases (injured or killed)	216	125	9	66	39

Identify the null and alternative hypotheses. Choose the correct answer below.

Compute the test statistic.( round 3 decimal places)

Find the critical value(s). (3 decimal places)

What is the conclusion based on the hypothesis test?

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